6、useRef 用法:例如要实现点击button按钮使input输入框获得焦点: import React, { useRef } from 'react'; constTest= () => { const inputEl = useRef(); return ( <> inputEl.current.focus()}>focus </> ); } export default Test 这样看起来非常像React.createRef(),将上面代码中的useRef()改...
import React, { useRef } from 'react'; import ReactDOM from 'react-dom'; function MyComponent() { const myRef = useRef(null); function handleClick() { if (myRef.current) { // myRef.current 现在指向了实际的 DOM 元素 console.log(myRef.current); } } return ( <div> <b...
import { useGSAP } from "@gsap/react"; import gsap from "gsap"; import { useRef } from "react"; gsap.registerPlugin(ScrollTrigger); export default function GsapScrollTrigger() { const scrollRef = useRef(); useGSAP( () => { const boxes = gsap.utils.toArray(scrollRef.current.children);...
//高阶函数 import React from 'react' // 高阶组件就是一个函数(纯函数) // 参数 组件(第一个参数必须是组件) export default function hoc(WrappedComponent){ return class extends React.Component{ constructor(props){ super(props) this.state = { msg:'helle-hoc', hocArr:[ {id:1,label:'hoc-1...
import { useState, useRef } from 'react'; import dynamic from 'next/dynamic'; import CommonHeaderIconBtn from './common-header-icon-btn'; import CommonHeaderIconBtn from './common-header-icon-btn'; import { Preferences, Publication, PublicationNavbarItem, User } from '../generated/graphql...
要调用子组件中的函数,需要使用ref属性来获取子组件的引用,并通过该引用调用子组件中的函数。首先,在父组件中定义一个ref: import React, { useRef } from 'react'; function Parent
SyntaxError:意外标识符‘EN以前，Jest可以很好地处理import语句；但是，在安装依赖项'react-router-...
SYA Investments - Import and Trade International is a long-standing and well-known company in the field of import and international trade, the company was founded in 2003.
reactjs 如何解决“SyntaxError：Cannot use import statement outside a module”while running jest test...
import MarkdownPreview from '@uiw/react-markdown-preview'; import { useContext, useEffect, useRef, useState } from "react"; import { Helmet } from 'react-helmet'; import { Header } from "../components/header"; import { Icon, IconSmall } from "../components/icon"; import { Padding }...